Hmm. So are market makers only ever effecting instantaneous matches? I was under the impression they often held some portion of the asset between buy-sell or s

Hmm. So are market makers only ever effecting instantaneous matches? I was under the impression they often held some portion of the asset between buy-sell or sell-buy in order to increase liquidity. (Which would explain why they like HFT, as anything that boosts trade frequency would decrease their exposure)